API de funciones para servicios agrupados en paquetes heredados
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Con la API de funciones, tu aplicación puede detectar interrupciones y tiempos de inactividad programados para funciones de API específicas. Puedes usar esta API para reducir el tiempo de inactividad en tu aplicación detectando funciones que no estén disponibles para luego saltearlas. .
Por ejemplo, si usas la API de Imágenes para cambiar el tamaño de las imágenes, puedes usar la API de funciones a fin de detectar el momento en que la API de Imágenes no estará disponible y evitar el cambio de tamaño:
Puedes consultar por separado si hay disponibilidad de opciones de lectura y de escritura de Datastore. El ejemplo que aparece a continuación muestra cómo detectar la disponibilidad de opciones de escritura en Datastore y cómo enviar un mensaje a los usuarios durante el tiempo de inactividad:
CapabilityStatusstatus=service.getStatus(Capability.DATASTORE_WRITE).getStatus();if(status==CapabilityStatus.DISABLED){// Datastore is in read-only mode.}
Usa la API de funciones en Java 8
Cada función se representa como una constante estática en la clase Función, como Capability.DATASTORE_WRITE.
Cada función tiene un estado que puedes recuperar desde CapabilitiesService.getStatus(Capability).
Cada estado tiene un estado, que es una enumeración que refleja la disponibilidad de una función: ENABLED o DISABLED. Consulta la lista de servicios que se encuentra a continuación para saber cuáles están habilitados en la API.
Funciones compatibles
Por el momento, la API admite las siguientes funciones:
[[["Fácil de comprender","easyToUnderstand","thumb-up"],["Resolvió mi problema","solvedMyProblem","thumb-up"],["Otro","otherUp","thumb-up"]],[["Difícil de entender","hardToUnderstand","thumb-down"],["Información o código de muestra incorrectos","incorrectInformationOrSampleCode","thumb-down"],["Faltan la información o los ejemplos que necesito","missingTheInformationSamplesINeed","thumb-down"],["Problema de traducción","translationIssue","thumb-down"],["Otro","otherDown","thumb-down"]],["Última actualización: 2025-09-04 (UTC)"],[[["\u003cp\u003eThe Capabilities API allows applications to detect outages and scheduled downtime for specific API capabilities, helping to minimize application downtime by bypassing unavailable services.\u003c/p\u003e\n"],["\u003cp\u003eThis API supports first-generation runtimes and can be utilized when upgrading to corresponding second-generation runtimes, with specific migration guidance provided for Java 11/17 runtimes.\u003c/p\u003e\n"],["\u003cp\u003eThe API returns an \u003ccode\u003eENABLED\u003c/code\u003e status for all services except "Datastore writes," which returns \u003ccode\u003eDISABLED\u003c/code\u003e when Datastore is in read-only mode.\u003c/p\u003e\n"],["\u003cp\u003eYou can query the availability of Datastore reads and writes separately, enabling you to handle read-only mode scenarios by displaying a custom message to users.\u003c/p\u003e\n"],["\u003cp\u003eThe API can verify the status of services like BLOBSTORE, Datastore, Images, Mail, Memcache, Task Queue, and URL Fetch, allowing for more fault-tolerant applications.\u003c/p\u003e\n"]]],[],null,["# Capabilities API for legacy bundled services\n\nWith the Capabilities API, your application can detect outages and scheduled\ndowntime for specific [API capabilities](#Supported_capabilities). You can use\nthis API to reduce downtime in your application by detecting when a capability\nis unavailable and then bypassing it. .\n| This API is supported for first-generation runtimes and can be used when [upgrading to corresponding second-generation runtimes](/appengine/docs/standard/\n| java-gen2\n|\n| /services/access). If you are updating to the App Engine Java 11/17 runtime, refer to the [migration guide](/appengine/migration-center/standard/migrate-to-second-gen/java-differences) to learn about your migration options for legacy bundled services.\n| Every status request to this API always returns `ENABLED` except\n| for the \"Datastore writes\" capability, which returns `DISABLED` if\n| Datastore is in read-only mode for your app.\n\nFor example, if you use the Images API to resize images, you can use the\nCapabilities API to detect when the Images API is unavailable and skip the\nresize: \n\n import com.google.appengine.api.capabilities.*;\n\n https://cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.capabilities.CapabilitiesService.html service =\n https://cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.capabilities.CapabilitiesServiceFactory.html.getCapabilitiesService();\n https://cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.capabilities.CapabilityStatus.html status = service.https://cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.capabilities.CapabilitiesService.html#com_google_appengine_api_capabilities_CapabilitiesService_getStatus_com_google_appengine_api_capabilities_Capability_(Capability.IMAGES).getStatus();\n\n if (status == https://cloud.google.com/appengine/docs/standard/java-gen2/reference/services/bundled/latest/com.google.appengine.api.capabilities.CapabilityStatus.html.DISABLED) {\n // Images API is not available.\n }\n\nYou can separately query for the availability of Datastore reads and writes. The\nfollowing sample shows how to detect the availability of Datastore writes and,\nduring downtime, provide a message to users: \n\n CapabilityStatus status =\n service.getStatus(Capability.DATASTORE_WRITE).getStatus();\n\n if (status == CapabilityStatus.DISABLED) {\n // Datastore is in read-only mode.\n }\n\nUsing the Capabilities API in Java 8\n------------------------------------\n\nEach Capability is represented as a static constant on the Capability class,\nsuch as\n[`Capability.DATASTORE_WRITE`](/appengine/docs/legacy/standard/java/javadoc/com/google/appengine/api/capabilities/Capability#DATASTORE_WRITE).\nEach Capability has a state, which you can retrieve from\n[`CapabilitiesService.getStatus(Capability)`](/appengine/docs/legacy/standard/java/javadoc/com/google/appengine/api/capabilities/CapabilitiesService#getStatus-com.google.appengine.api.capabilities.Capability-).\nEach state has a status, which is an enumeration reflecting a the availability\nof a capability: either `ENABLED` or `DISABLED`. See below for the\n[list of services](#Supported_capabilities) currently enabled in this API.\n\nSupported capabilities\n----------------------\n\nThe API currently supports the following capabilities:"]]
